Mabatis multi-sql execution problem

Why do I add & allowMultiQueries=true, to my database connection, and then mybatis writes two sql, in a xml method separated by semicolons, but it can"t be executed in batches? it"s OK to solve

Mar.03,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b320fa-2bdee.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b320fa-2bdee.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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